Results 251 to 260 of about 7,207,987 (296)

Divisors and Harmonic Currents

2001
In the first two sections of the present chapter we introduce a conjecture (Conjecture 7.1) which specifies the idea that the characterization of the divisor of the Selberg zeta function of the a-twisted geodesic flow proved in Chapter 3 Section 3.3 is related to its characterizations in terms of a-twisted harmonic currents on SX.
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Superposition of current and voltage harmonics

2018 ELEKTRO, 2018
This paper deals with power quality that is aimed on voltage and current harmonics. The analysis describes the household appliances producing the harmonic interference, because they consist of semiconductor components. The next reason is that a large number of household appliances are operated in the same time.
Andrej Bolf, Alena Otcenasova, Michal Regula, Marek Novak   +3 more
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Even harmonics in alternating-current circuits

Proceedings of the American Institute of Electrical Engineers, 1909
In the usual presentation and consideration of wave-forms in alternating-current circuits we are so used to the mathematical expressions which omit the second, fourth, sixth, etc. harmonics and so generally assume that these even harmonics can be neglected at the outset, that a short consideration of usual and special conditions, giving rise to even ...
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Transformer inrush - Harmonics in the current

2018 19th International Scientific Conference on Electric Power Engineering (EPE), 2018
When transformer is energized, a transient current up to 10 to 15 times larger than the rated transformer current can flow for several cycles. The differential protections are mainly sensitive during this time, as the inrush current flows just on one site of the transformer and so it creates false differential current.
Bermann Jiri, Prochazka Martin
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Cascaded Harmonic Current Control Loop for VSG Harmonic Current Suppression

2023 4th International Conference on Power Engineering (ICPE), 2023
Fan Yang, Xiaodong Tian, Lan Wu, Huansen Hong, Hengjie Jia, Junjie Feng   +5 more
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Harmonic reduction in thyristor converters by harmonic current injection

IEEE Transactions on Power Apparatus and Systems, 1976
The paper describes analytical and experimental results for a new method of current harmonic reduction in thyristor converters. The principle of the method is to modify the current waveforms on the d.c. windings of the converter transformer by injecting harmonic currents at a particular frequency.
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Harmonic analysis of current waveforms using optical current sensor

IEEE Transactions on Instrumentation and Measurement, 2002
This paper reports on the research and development of an optical current sensor for harmonic analysis within the electricity supply network. The device has a measurement capability, limited by the sampling frequency of the analog-to-digital converter, to around 20 kHz. We report on experimental verification of these measurements up to the 60th harmonic
Michie, W.C., Cruden, A.J., Niewczas, P., Madden, W.I., McDonald, J.R., Gauduin, M.   +5 more
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Influence of Harmonic System Voltages on the Harmonic Current Emission of Photovoltaic Inverters

2007 International Conference on Power Engineering, Energy and Electrical Drives, 2007
Harmonic currents of photovoltaic (PV)-inverters show a significant dependency on the harmonic voltage content of the alternating current (AC)-system voltage. Measurements of harmonic currents were carried out in low-voltage (LV)-systems and under laboratory test conditions with adjustable harmonic content of the AC-voltage.
J. SCHLABBACH, A. GROSS, CHICCO, GIANFRANCO   +2 more
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Harmonic pricing model based on harmonic costs and harmonic current excessive penalty

2011 2nd International Conference on Artificial Intelligence, Management Science and Electronic Commerce (AIMSEC), 2011
Harmonic will do great harm to power grid and cause economic losses. In order to reduce such losses, the power utilities need additional investment for harmonic suppression measures. The harmonic losses and the additional investment capital together constitute the harmonic costs and they are the basis of harmonic pricing.
null Yong Peng, null Shun Tao, null Qun Xu, null Xiangning Xiao   +3 more
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Non-harmonic alternating currents

Journal of the A.I.E.E., 1927
Certain principles are presented for solving non-harmonic a-c. problems. Graphical methods are already well known for solving practically any problem, when currents and electromotive forces are sinusoidal, by vector diagrams in a plane. In certain special cases such diagrams give correct results when currents and electromotive forces are non-sinusoidal,
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